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Crystal Structure:
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Pauling L , Klug H P , Winchell A N , American Mineralogist , 20 (1935) p.492-501, The crystal structure of swedenborgite, NaBe4SbO7
View Additional jPOWD Structure files for Swedenborgite
[1]
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Hardness:
8 - Topaz
Luminescence:
Fluorescent, Short UV=sky blue, Long UV=deep red.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Swedenborgite
Dichroism (e):
colorless.
Dichroism (w):
colorless.
Gladstone-Dale:
CI meas= 0.036 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1801,KPDmeas= 0.1799,KC= 0.1866 Ncalc = 1.8
Optical Data:
Uniaxial (-), e=1.77, w=1.772, bire=0.0020.
Calculated Properties of Swedenborgite
Electron Density:
Bulk Density (Electron Density)=3.92 gm/cc note: Specific Gravity of Swedenborgite =4.28 gm/cc.
Fermion Index:
Fermion Index = 0.12 Boson Index = 0.88
Photoelectric:
PESwedenborgite = 133.86 barns/electron U=PESwedenborgite x rElectron Density= 524.42 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Swedenborgite is Not Radioactive